Solid-phase assays of receptor-binding specificity.

Area of Science:

• Virology
• Biochemistry
• Immunology

Background:

• Influenza virus infection begins with binding to sialic acid molecules on host cells.
• Differences in sialic acid receptors across species influence influenza virus host range and tropism.
• Understanding viral receptor specificity is crucial for developing effective influenza vaccines and antiviral drugs.

Purpose of the Study:

• To describe two novel solid-phase enzyme-linked receptor-binding assays.
• To enable the measurement of influenza virus binding to various sialic acid analogues.
• To provide insights into factors governing viral host range and pathogenesis.

Main Methods:

• Two enzyme-linked immunosorbent assays (ELISA)-like protocols were developed.
• Assays immobilize influenza virus and measure binding to soluble sialic acid analogues.
• Direct binding and fetuin-binding inhibition assays quantify virus-receptor interactions and association constants.

Main Results:

• The assays allow for the determination of influenza virus binding to diverse receptor analogues.
• Apparent association constants for virus-receptor complexes can be calculated.
• The fetuin-binding inhibition assay quantifies analogue competition for virus binding.

Conclusions:

• These assays offer a robust method for characterizing influenza virus receptor specificity.
• The developed protocols can aid in understanding viral adaptation and host tropism.
• This knowledge can inform the design of next-generation influenza vaccines and therapeutics.